% % % 颜色背景
\usemodule[visual]
\setuplayout[header=1cm,footer=1cm,topspace=1cm,bottomspace=1cm]
\setupbackgrounds [footer]                [background=color, backgroundcolor=lightgray]
\setupbackgrounds [footer]  [leftmargin]  [background=color, backgroundcolor=yellow]
\starttext
    \fakewords{20}{30}
\stoptext